My one year old suddenly has diarrhea?

Rest the intestines. May be from something ingested or viral infection. Should not have blood, or watery stool every half hour. If no urine/tears, see physician immediately. Start w/fruit-flavored pedialyte, 1 tbs every 3min for 1hr. Then let drink freely for 12hrs. Then advance to bananas, applesauce, rice, toast (bart diet). Last thing to add is dairy products.